BibTeX @techreport{Claesson2011,author={Claesson, Johan and Nielsen, Anker},title={Melting and freezing of snow on a roof. Mathematical report},publisher={Chalmers University of Technology},place={Göteborg},year={2011},series={Report - Division of Environmental Systems Analysis, Chalmers University of Technology, no: 2011:3},note={39},}